Vibration And Shock; Operating Vibration; Nonoperating Vibration - Hitachi T7K250 - Deskstar - Hard Drive Specifications

7.6 Vibration and shock

All vibration and shock measurements recorded in this section are made with a drive that has no mounting attach-
ments for the systems. The input power for the measurements is applied to the normal drive mounting points.

7.6.1 Operating vibration

7.6.1.1 Random vibration
The test is 30 minutes of random vibration using the power spectral density (PSD) levels shown below in each of
three mutually perpendicular axes. The disk drive will operate without non-recoverable errors when subjected to
the above random vibration levels.
The overall RMS (root mean square) level is 0.67 G for horizontal vibration and 0.56 G for vertical.
Table 40: Random vibration PSD profile break points (operating)
Direction
Horizontal x10–3
0.02
[G2/Hz
Vertical x10–3 0.02
[G2/Hz]
The overall RMS (root mean square) level is 0.67 G for horizontal vibration and 0.56 G for vertical.
7.6.1.2 Swept sine vibration
The drive will meet the criteria shown below while operating in the specified conditions:
• No errors occur with 0.5 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute
dwells at two major resonances
• No data loss occurs with 1 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute
dwells at two major resonances

7.6.2 Nonoperating vibration

The drive does not sustain permanent damage or loss of previously recorded data after being subjected to the envi-
ronment described below
7.6.2.1 Random vibration
The test consists of a random vibration applied in each of three mutually perpendicular axes for a duration of 10
minutes per axis. The PSD levels for the test simulate the shipping and relocation environment shown below.
Table 41: Random Vibration PSD profile breakpoints (nonoperating)
Frequency 2Hz
G2/Hz 0.001
5Hz 17Hz 45Hz
1.1 1.1
1.1 1.1
4Hz 8Hz
0.03 0.03
Deskstar T7K250 Hard Disk Drive Specification
48Hz 62Hz 65Hz
8.0 8.0 1.0
8.0 8.0 1.0
40Hz 55Hz
0.003 0.01
62
150Hz 200Hz 500Hz
1.0 0.5 0.5
1.0 0.08 0.08
70Hz 200Hz
0.01 0.001
RMS
(G)
0.67
0.56